Section 4 Unattended machinery space(s) — UMS notation

4.1.1 Where it is proposed to operate the following machinery in an unattended space, no matter what period is envisaged, the controls, alarms and safeguards required by the appropriate Chapters together with those given in Vol 2, Pt 9, Ch 1, 4.2 Alarm systems for machinery to Vol 2, Pt 9, Ch 1, 4.8 Supply of electric power, general are to be provided:

• Air compressors.
• Controllable pitch propellers and transverse thrust units.
• Electric generating plant.
• Incinerators.
• Fuel oil transfer and storage systems (purifiers and oil heaters).
• Mobility systems.
• Steam raising plant (boilers and their ancillary equipment).
• Thermal fluid heaters.

4.2.1 An alarm system which will provide warning of faults in the machinery is to be installed. The system is to satisfy the requirements of Vol 2, Pt 9, Ch 7, 4.3 Alarm systems, general requirements.

4.2.2 An audible signal and visual indication of machinery alarms are to be relayed to the engineers’ accommodation so that engineering personnel are made aware that a fault has occurred.

4.2.3 The engineers' alarm required by Vol 2, Pt 9, Ch 7, 4.2 Control stations for machinery 4.2.3 is to be activated automatically in the event that a machinery alarm has not been acknowledged in the space within a predetermined time.

4.2.4 An audible signal and visual indication of machinery alarms are to be relayed to the navigating bridge control station in such a way that the navigating officer of the watch is made aware when:

1. a machinery fault has occurred;

2. the machinery fault is being attended to; and

3. the machinery fault has been rectified.

4.2.5 Group alarms may be arranged on the bridge to indicate machinery faults, but alarms associated with faults requiring speed or power reduction or the automatic shutdown of propulsion machinery are to be identified by separate group alarms or by individual alarms.

4.3.1 A bridge control system for the propulsion machinery is to be fitted. The system is to satisfy the requirements of Vol 2, Pt 9, Ch 7, 4.6 Bridge control for main propulsion machinery.

4.4.1 A control station(s) is to be provided in the space and on the bridge which satisfies the requirements of Vol 2, Pt 9, Ch 7, 4.2 Control stations for machinery.

4.5.1 An automatic fire detection system is to be fitted in the space together with an audible and visual alarm system. The system is to satisfy the requirements of Vol 2, Pt 9, Ch 9, 4.1 General.

4.6.1 Where fixed water-based local application fire-fighting systems are installed, they are to satisfy the requirements of Vol 2, Pt 9, Ch 9, 5 Fire safety systems.

4.6.2 Fixed water-based local application fire-fighting systems are to be capable of automatic release in accordance with FSS Code - Fire Safety Systems – Resolution MSC.98(73) or an alternative standard defined by the Naval Administration.

4.7.1 An alarm system is to be provided to warn when liquid in machinery space bilges has reached a predetermined level, and is to comply with Vol 2, Pt 9, Ch 7, 4.3 Alarm systems, general requirements This level is to be sufficiently low to prevent liquid from overflowing from the bilges onto the tank top. The number and location of detectors are to be such that accumulation of liquids will be detected at all angles of heel and trim.

4.7.2 Local or remote controls of any valve within the space serving a sea inlet, a discharge below the waterline, a dewatering system should be so sited as to be readily accessible and to allow adequate time for operation in case of influx of water to the space, having regard to the time which could be taken to reach and operate such controls.

4.7.3 Where the bilge pumps are arranged to start automatically, means are to be provided to indicate if the influx of liquids is greater than the pump capacity or, if the pump is operating more frequently than would be expected. Special attention should be given to oil pollution prevention requirements.

4.8.1 For naval ships operating with one generator set in service, arrangements are to be such that a standby generator will automatically start and connect to the switchboard in as short a time as practicable, but in any case within 45 seconds, on loss of the service generator. For naval ships operating with two or more generator sets in service, arrangements are to be such that on loss of one generator the remaining one(s) are to be adequate for continuity of Mobility and/or Ship Type systems. For the detailed requirements of these arrangements, see Vol 2, Pt 9, Ch 2, 4.2 Number and rating of generators and converting equipment

4.8.2 Alarms and safeguards are indicated in Table 1.4.1 Electric system: alarms and safeguards.